Rear suspension mechanism for remote control model car

ABSTRACT

A remote control model car has a rear suspension mechanism mounted in either side of the chassis. The chassis has a suspension body. The rear suspension mechanism comprises a pivotal adjustment rod coupled to the lug of the suspension body, a pivotal arm mechanism, a hub mechanism, and a shock absorber pivotably secured to the arm mechanism and the suspension body. This can effect a smooth, simple, and reliable wheel angle adjustment.

FIELD OF THE INVENTION

[0001] The present invention relates to remote control model cars and mere particularly to a rear suspension mechanism for model jeep with improved characteristics

BACKGROUND OF THE INVENTION

[0002] Conventionally, remote control model cars are classified as remote control model racing cars for planar ground or model jeeps for uneven terrain (as the subject matter of the invention) Hence, the construction of the latter is required to be more robust and capable of easily adjusting Typically, two rear wheels are driven by a drive source through a transmission mechanism. Further, a shock absorber is provided and associated with each rear wheel. Each of the front and the rear sides of wheel may be positioned at an angle with respect to ground. An offset angle is defined as the angle of rear transmission axle with respect to rear wheel in a horizontal plane. An inclined angle is defined as the angle of the surface of rear wheel with respect to a vertical plane. In general, the surface of rear wheel is inclined toward inside of model jeep for increasing the centripetal force while manipulating the model jeep.

[0003] A schematic rear plan view in portion section of a conventional remote control model jeep is shown in FIG. 5. A transmission seat 17 is provided on chassis 1. A suspension body 11 is provided adjacent transmission seat 17. A bar on suspension body 11 is coupled to the top of hub mechanism 8. An arm mechanism 3 under suspension body 11 is coupled to the bottom of hub mechanism 8. A transmission rod 18 is passed through universal joint 181 and hub mechanism 8 to couple transmission seat 17 and hub 19 of wheel together. Following is a description of the adjustment of inclined angle and offset angle. As to the adjustment of inclined angle, it is required to replace a bar. Hence, it is inconvenient. As to the adjustment of offset angle, first detach a fastening block in the suspension body 11. Then replace with a new fastening block. Fastening block is inserted through shaft coupled to suspension body 11. Thus the angle of shaft may be adjusted. That is, the angle of shaft is determined by the positions of two end holes of fastening block, At this time, the angle of shaft is identical to that of offset angle. In view of above, the adjustment of offset angle is much more inconvenient. To the worse, the normal operation of arm mechanism 3 may be adversely affected. As a result, most users only set up the model jeep in a less precise manner. Thus such model jeep does not perform well in a difficult terrain which in turn dissatisfies an enthusiastic user.

[0004] Thus, it is desirable to provide an improved rear suspension mechanism for remote control model jeep in order to overcome the above drawbacks of prior art.

SUMMARY OF THE INVENTION

[0005] It is an object of the present invention to provide a rear suspension mechanism for a remote control model car for effecting a smooth, simple, and reliable wheel angle adjustment. Further, it is possible to adjust the distance between two rear wheels and the length of model jeep.

[0006] To achieve the above and other objects, the present invention provides a remote control model car having a chassis with a rear suspension mechanism mounted in either side of the chassis, the chassis having a suspension body in the rear including a transmission seat, a coupling on either side of the transmission seat coupled to a universal joint at the internal end of a transmission rod, a lug on either side of the upper portion of the suspension body, a first ear on either side of the lower part of the suspension body, a fastening block at either front or rear side, a shaft secured bet a second ear on either side, of the fastening block, and a shaft secured between the first and the second ears, the rear suspension mechanism comprising a pivotal adjustment rod coupled to the lug of the suspension body, the adjustment rod including a center enlargement, two threaded rods on either side of the center enlargement, and two end joints such that the length of the adjustment rod is adjustable by adjusting the securing of the threaded rods and the end joints; a pivotal arm mechanism including two sleeves put on the shaft between the first and the second ears, each sleeve being abutted on one of the first and the second ears; a hub mechanism having an upper part coupled to the adjustment rod and a lower part coupled to the arm mechanism respectively, one end of the transmission rod being passed through the universal joint to couple to a joint of a pin mechanism, the other end of the pin mechanism formed as a bar passed through the hub mechanism, a bearing put on the bar of the pin mechanism, the bearing placed within the hub mechanism the bar of the pin mechanism passed through the hub mechanism, a fastener sleeved on the bar and secured to a rear wheel, a pair of parallel adjustment members at the external ends of the arm mechanism being threadedly secured to a bolt having a ball-shaped head secured in one of two fork members of the hub mechanism; and a shock absorber having a bottom end pivotably secured to an engagement member of the arm mechanism and a top end secured to the suspension body.

[0007] The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008]FIG. 1 is a perspective exploded view of a rear suspension mechanism for a remote control model jeep according to the invention;

[0009]FIG. 2 is an exploded view of the FIG. 1 model jeep;

[0010]FIG. 3 is a schematic top plan view of the FIG. 1 model jeep illustrating the adjustment of offset angle;

[0011]FIG. 4 is a schematic rear plan view in portion section of the FIG. 1 model jeep illustrating the adjustment of inclined angle, and

[0012]FIG. 5 is a rear plan view in portion section of rear suspension mechanism for a conventional remote control model jeep.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Referring to FIGS. 1 through 4, there is shown a remote control model jeep incorporating a rear suspension mechanism in accordance with then invention. A suspension body 11 is provided in the rear of chassis 1. A transmission seat 17 is provided in suspension body 11. A coupling 171 on either side of transmission seat 17 is coupled to a universal joint 181 at the internal end of transmission rod 18. A lug 12 on either side of the upper part of suspension body 11 is coupled to the internal end of adjustment rod 2. Adjustment rod 2 has a center enlargement 22, two threaded rods 21 on either side of center enlargement 22, and two joints 23 and 24 on both ends. The length of adjustment rod 2 may be adjusted by adjusting the securing of the threaded rods 21 and joints 23 and 24. A first ear 13 is provided on either side of the lower part of suspension body 11. A second ear 15 is provided on either side of fastening block 14, A shaft 16 is secured between first and second ears 13 and 15. Both arm mechanism 3 and adjustment rod 2 may pivot. Two sleeves 31 of arm mechanism 3 are put on shaft 16 between ears 13 and 15. Each sleeve 31 is abutted on ear 13 or 15. The upper and lower parts of a hub mechanism 4 are coupled to adjustment rod 2 and arm mechanism 3 respectively. One end of a transmission rod 18 is passed through universal joint 182 to couple to a joint 191 of pin mechanism 19. The other end of pin mechanism 19 is formed as a bar 192 passed through hole 41 of hub mechanism 4. A bearing 193 is put on bar 192 of pin mechanism 19. Bearing 193 is placed within hole 41 of hub mechanism 4. Bar 192 of pin mechanism 19 is passed through hub mechanism 4. A fastener 194 is sleeved on the passed bar 192 and is positioned in the hub of wheel 5. A nut 195 is secured to the external end of fastener 194 such that wheel 5 may rotate about pin mechanism 19. A pair of parallel adjustment members 38 are provided at the external ends of arm mechanism 3. A threaded hole is formed at one end of parallel adjustment member 38 for threadedly securing to a threaded shank 33 of bolt 32. Ball-shaped head 34 of bolt 32 is placed in a threaded hole 43 of one of two fork members 42 at the lower portion of hub mechanism 4. Ball-shaped head 34 of bolt 32 is further secured by a washer 44 and nut 45. A shock absorber 6 has a bottom end pivotably secured to an engagement member 35 of arm mechanism 3 and a top end secured to one of holes 101 of projecting member 10. Likewise, a plurality of holes 47 are formed at each of a pair of lugs 46 on the top of hub mechanism 4. A threaded hole 36 is provided at the internal side of arm mechanism 3. A screw 37 is secured in threaded hole 36 wherein the bottom end of screw 37 is projected from the underside of arm mechanism 3. Hence, the bottom end of screw 37 is first in contact with chassis 1 for holding it when arm mechanism 3 is about to contact the top of chassis 1. Then wheel 5 is moved up together with arm mechanism 3. In turn, the frame of model jeep is lowered to prevent arm mechanism 3 from contacting ground. This is a sate mechanism. An opening 351 of engagement member 35 is pivotably secured to the bottom end of shock absorber 6 by inserting a pin through a plurality of holes 352. Hence, it is possible to adjust the tightness of shock absorber 6 with respect to arm mechanism 3 by selecting one of the plurality of holes 352.

[0014] Referring to FIG. 3 specifically, the angle adjustment of offset angle may be effected by adjusting the positions of two bolts 32. In detail, suitably turn nut 45 loose. Then turn bolt 32 for adjusting the length of arm mechanism 3. As a result, the angle adjustment of offset angle may be carried out by simply using a box end wrench. Thus, it is very convenient.

[0015] Referring to FIG. 4 specifically, the angle adjustment of inclined angle may be effected by adjusting adjustment rod 2. In detail, user may turn nut 45 or as stated above select a suitable hole 352 in securing shock absorber 6 to arm mechanism 3. Thus a more flexible and effective adjustment of inclined angle is carried out. Further, it is possible to adjust the distance between two rear wheels by turning bolt 32 for adjusting the length of arm mechanism 3. Furthermore, it is possible to adjust the length of model jeep by adding or removing a plurality of washers 351 between sleeves 31 and first ears 13 wherein washers 351 are put on shaft 16.

[0016] While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims. 

What is claimed is:
 1. A remote control model car having a chassis with a rear suspension mechanism mounted in either side of said chassis, said chassis having a suspension body in said rear including a transmission seat, a coupling on either side of said transmission seat coupled to a universal joint at said internal end of a transmission rod, a lug on either side of said upper portion of said suspension body, a first ear on either side of said lower part of said suspension body, a fastening block at either front or rear side, a shaft secured bet a second ear on either side of said fastening block, and a shaft secured between said first and said second ears, said rear suspension mechanism comprising: a pivotal adjustment rod coupled to said lug of said suspension body, said adjustment rod including a center enlargement, two threaded rods on either side of said center enlargement, and two end joints such that said length of said adjustment rod is adjustable by adjusting said securing of said threaded rods and said end joints; a pivotal arm mechanism including two sleeves put on said shaft between said first and said second ears, each sleeve being abutted on one of said first and said second ears; a hub mechanism having an upper part coupled to said adjustment rod and a lower part coupled to said arm mechanism respectively, one end of said transmission rod being passed through said universal joint to couple to a joint of a pin mechanism, said other end of said pin mechanism formed as a bar passed through said hub mechanism, a bearing put on said bar of said pin mechanism, said bearing placed within said hub mechanism said bar of said pin mechanism passed through said hub mechanism, a fastener sleeved on said bar and secured to a rear wheel, a pair of parallel adjustment members at said external ends of said arm mechanism being threadedly secured to a bolt having a ball-shaped head secured in one of two fork members of said hub mechanism; and a shock absorber having a bottom end pivotably secured to an engagement member of said arm mechanism and a top end secured to said suspension body.
 2. The remote control model car of claim 1, wherein said suspension body further comprises a projecting member on said top and a plurality of apertures on said projecting member.
 3. The remote control model car of claim 1, wherein said hub mechanism further comprises a pair of lugs on said top and a plurality of holes at each lug.
 4. The remote control model car of claim 1, wherein said arm mechanism further comprises a threaded hole at said internal side and a screw secured in said threaded hole.
 5. The remote control model car of claim 1, wherein said engagement member comprises an opening and a plurality of transverse holes adjacent said opening. 